Question 1

The HI bond has a length of 161 pm and 4.92% ionic character.What is the experimental dipole moment of HI?

Accepted Answer

A) 0)380 D 
B) 0)772 D 
C) 3)80 D 
D) 7)72 D 
A) 0)380 D 
B) 0)772 D 
C) 3)80 D 
D) 7)72 D

Question 2

The normal boiling point of this substance is approximately

Accepted Answer

A) 25°C. 
B) 140°C. 
C) 300°C. 
D) 350°C. 
A) 25°C. 
B) 140°C. 
C) 300°C. 
D) 350°C.

Question 3

Ethyl chloride,C2H5Cl,is used as a local anesthetic.It works by cooling tissue as it vaporizes;its heat of vaporization is 26.4 kJ/mol.How much heat could be removed by 20.0 g of ethyl chloride?

Accepted Answer

A) 8)18 kJ 
B) 341 kJ 
C) 528 kJ 
D) 3410 kJ 
A) 8)18 kJ 
B) 341 kJ 
C) 528 kJ 
D) 3410 kJ

Question 4

Cesium has a radius of 272 pm and crystallizes in a face-centered cubic unit cell.What is the edge length of the unit cell?

Accepted Answer

A) 314 pm 
B) 385 pm 
C) 544 pm 
D) 769 pm 
A) 314 pm 
B) 385 pm 
C) 544 pm 
D) 769 pm

Question 5

In liquid methanol,CH3OH,which intermolecular forces are present?

Accepted Answer

A) Dispersion,hydrogen bonding and dipole-dipole forces are present. 
B) Only dipole-dipole and ion-dipole forces are present. 
C) Only dispersion and dipole-dipole forces are present. 
D) Only hydrogen bonding forces are present. 
A) Dispersion,hydrogen bonding and dipole-dipole forces are present. 
B) Only dipole-dipole and ion-dipole forces are present. 
C) Only dispersion and dipole-dipole forces are present. 
D) Only hydrogen bonding forces are present.

Question 6

Which of the following forms a molecular solid?

Accepted Answer

A) NH4NO3 
B) C6H4Cl2 
C) SiO2 
D) copper 
A) NH4NO3 
B) C6H4Cl2 
C) SiO2 
D) copper

Question 7

Which of the following is not an allotrope of carbon?

Accepted Answer

A) coal 
B) diamond 
C) fullerene 
D) graphite 
A) coal 
B) diamond 
C) fullerene 
D) graphite

Question 8

An element forms a body-centered cubic crystalline substance.The edge length of the unit cell is 287 pm and the density of the crystal is 7.92 g/cm3.Calculate the atomic weight of the substance.

Accepted Answer

A) 45.0 amu 
B) 48.0 amu 
C) 56.4 amu 
D) 63.5 amu 
A) 45.0 amu 
B) 48.0 amu 
C) 56.4 amu 
D) 63.5 amu

Question 9

The picture shown below represents a two-dimensional lattice of atoms M and X.  
-What is the formula of the compound formed from M and X?

Accepted Answer

A) MX 
B) MX2 
C) MX3 
D) MX4 
A) MX 
B) MX2 
C) MX3 
D) MX4

Question 10

Which of the following forms a molecular solid?

Accepted Answer

A) CaO 
B) C10H22 
C) C(graphite) 
D) gold 
A) CaO 
B) C10H22 
C) C(graphite) 
D) gold

Question 11

Cesium has a radius of 272 pm and crystallizes in a body-centered cubic structure.What is the edge length of the unit cell?

Accepted Answer

A) 314 pm 
B) 385 pm 
C) 544 pm 
D) 628 pm 
A) 314 pm 
B) 385 pm 
C) 544 pm 
D) 628 pm

Question 12

The cubic closest-packed arrangement of atoms is the same as which cubic unit cell?

Accepted Answer

The answer of The cubic closest-packed arrangement of atoms is...

Question 13

Which of the following phase changes has a positive value for its entropy change?

Accepted Answer

A) boiling water 
B) formation of raindrops from a cloud 
C) making dry ice from gaseous CO2 
D) making ice cubes from liquid water 
A) boiling water 
B) formation of raindrops from a cloud 
C) making dry ice from gaseous CO2 
D) making ice cubes from liquid water

Question 14

A certain mineral,MS1U1B1xS1U1B0M'S1U1B1yS1U1B0AS1U1B1zS1U1B0,crystallizes in the cubic unit cell shown below.M and M' represent cations and A represents the anions.  
-How many cations M are in the unit cell?

Accepted Answer

A) 1 
B) 2 
C) 4 
D) 8 
A) 1 
B) 2 
C) 4 
D) 8

Question 15

Ethyl chloride,C2H5Cl,is used as a local anesthetic.It works by cooling tissue as it vaporizes.The heat of vaporization is 26.4 kJ/mol.How much heat could be removed by 10.0 g of ethyl chloride?

Accepted Answer

A) 4)09 kJ 
B) 170 kJ 
C) 264 kJ 
D) 1700 kJ 
A) 4)09 kJ 
B) 170 kJ 
C) 264 kJ 
D) 1700 kJ

Question 16

The magnitude of the heats of vaporization,fusion and sublimation of a substance reflect the

Accepted Answer

A) density of the substance. 
B) magnitudes of the boiling and melting points of the substance. 
C) strength of the covalent bonds between atoms in each molecule of the substance. 
D) strength of the intermolecular forces of the substance. 
A) density of the substance. 
B) magnitudes of the boiling and melting points of the substance. 
C) strength of the covalent bonds between atoms in each molecule of the substance. 
D) strength of the intermolecular forces of the substance.

Question 17

From the phase diagram above,the minimum pressure at which this substance can exist in the liquid phase is

Accepted Answer

A) 0)25 atm. 
B) 0)45 atm. 
C) 1)0 atm. 
D) 1)2 atm. 
A) 0)25 atm. 
B) 0)45 atm. 
C) 1)0 atm. 
D) 1)2 atm.

Question 18

The plots below represent vapor pressure vs.temperature curves for diethyl ether,ethanol,mercury,and water,not necessarily in that order.  
-Based on the relative strengths of the intermolecular forces of attraction of each substance,which is the most likely vapor pressure vs.temperature curve for diethyl ether?

Accepted Answer

A) curve (a) 
B) curve (b) 
C) curve (c) 
D) curve (d) 
A) curve (a) 
B) curve (b) 
C) curve (c) 
D) curve (d)

Question 19

For which of the following phase changes is the sign of ΔS negative?

Accepted Answer

A) boiling of water 
B) formation of snow from water vapor in clouds 
C) melting of ice cream 
D) sublimation of I2 
A) boiling of water 
B) formation of snow from water vapor in clouds 
C) melting of ice cream 
D) sublimation of I2

Question 20

The plots below represent vapor pressure vs.temperature curves for diethyl ether,ethanol,mercury,and water,not necessarily in that order.  
-Based on the relative strengths of the intermolecular forces of attraction of each substance,which is the most likely vapor pressure vs.temperature curve for mercury?

Accepted Answer

A) curve (a) 
B) curve (b) 
C) curve (c) 
D) curve (d) 
A) curve (a) 
B) curve (b) 
C) curve (c) 
D) curve (d)

Exam 10: Liquids,solids,and Phase Changes

The HI bond has a length of 161 pm and 4.92% ionic character.What is the experimental dipole moment of HI?

The normal boiling point of this substance is approximately

Ethyl chloride,C2H5Cl,is used as a local anesthetic.It works by cooling tissue as it vaporizes;its heat of vaporization is 26.4 kJ/mol.How much heat could be removed by 20.0 g of ethyl chloride?

Cesium has a radius of 272 pm and crystallizes in a face-centered cubic unit cell.What is the edge length of the unit cell?

In liquid methanol,CH3OH,which intermolecular forces are present?

Which of the following forms a molecular solid?

Which of the following is not an allotrope of carbon?

An element forms a body-centered cubic crystalline substance.The edge length of the unit cell is 287 pm and the density of the crystal is 7.92 g/cm3.Calculate the atomic weight of the substance.

The picture shown below represents a two-dimensional lattice of atoms M and X. -What is the formula of the compound formed from M and X?

Which of the following forms a molecular solid?

Cesium has a radius of 272 pm and crystallizes in a body-centered cubic structure.What is the edge length of the unit cell?

The cubic closest-packed arrangement of atoms is the same as which cubic unit cell?

Which of the following phase changes has a positive value for its entropy change?

A certain mineral,MxM'yAz,crystallizes in the cubic unit cell shown below.M and M' represent cations and A represents the anions. -How many cations M are in the unit cell?

Ethyl chloride,C2H5Cl,is used as a local anesthetic.It works by cooling tissue as it vaporizes.The heat of vaporization is 26.4 kJ/mol.How much heat could be removed by 10.0 g of ethyl chloride?

The magnitude of the heats of vaporization,fusion and sublimation of a substance reflect the

From the phase diagram above,the minimum pressure at which this substance can exist in the liquid phase is

For which of the following phase changes is the sign of ΔS negative?

Chemistry: Matter and Measurement

Atoms, molecules, and Ions

Formulas, equations, and Moles

Reactions in Aqueous Solutions

Periodicity and the Atomic Structure of Atoms

Ionic Bonds and Some Main-Group Chemistry

Covalent Bonds and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Solutions and Their Properties

Chemical Kinetics

Chemical Equilibrium

Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

Electrochemistry

Hydrogen, oxygen, and Water

The Main-Group Elements

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

Nuclear Chemistry

Organic and Biological Chemistry

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Ethyl chloride,C₂H₅Cl,is used as a local anesthetic.It works by cooling tissue as it vaporizes;its heat of vaporization is 26.4 kJ/mol.How much heat could be removed by 20.0 g of ethyl chloride?

In liquid methanol,CH₃OH,which intermolecular forces are present?

An element forms a body-centered cubic crystalline substance.The edge length of the unit cell is 287 pm and the density of the crystal is 7.92 g/cm³.Calculate the atomic weight of the substance.

A certain mineral,M_xM'_yA_z,crystallizes in the cubic unit cell shown below.M and M' represent cations and A represents the anions. -How many cations M are in the unit cell?

Ethyl chloride,C₂H₅Cl,is used as a local anesthetic.It works by cooling tissue as it vaporizes.The heat of vaporization is 26.4 kJ/mol.How much heat could be removed by 10.0 g of ethyl chloride?